How many feet is the suggested jump off a bridge to die?

The minimal required vertical distance is avergaed at about 4 feet.

10 feet is sufficient, provided you dive Head first!!.

a 3 story building would work better but you should really reconsider and come to my house for a slumberparty

Eh... I think gravity's acceleration may come into play as each second you fall you speed up another 9.8 meters per second. A suffice amount of force should cause a quick end... Wait! What am I saying? Don't do it man! D:

The most important factor in suicide by jumping is height. Stone2 states that jumping from 150 feet (46 metres) or higher on land, and 250 feet (76 metres) or more on water, is 95% to 98% fatal. 150 feet/46 metres, equates to roughly 10 to 15 stories in a building, depending on the height of one story. 250 feet is the height of the Golden Gate Bridge in San Francisco. (http://lostallhope.com/suicide-methods/jumping-high-building)